That could very well be however this is a brand new house with a new lawn so I have hoses and sprinklers all over the place. My house also has 18 corners. You really need to think about the total time required including all support activities. It is not like the clock starts and stops with the blades on the mower.
1) Get ready to mow. Throw on old clothes and shoes. Get head phones / ear protection (5 min)
2) Get out mower and set up for mulch, throw, or bag depending on lawn conditions. Set proper height. Add gas. Sometimes check oil (5 min)
3) Disconnect all 6 sprinklers and move hoses out of the way (5 min)
4) Tilt up down spouts, remove kid toys, pick up dog crap. Charge up trimmer. (10 min)
5) Mow front left and left side (10 min)
6) Trim mow back (10 min)
7) Mow back (30 min)
8) Mow right side and front right (10 min)
9) Get out blower and house. Clean up mower with blower and washout. Put away (5 min)
10) Get out trimmer, check string, edge driveway, sidewalk, curb 300 ft (10 min)
11) Edge around the house / deck (5 min)
12) Blow off edger and put away. Blow off sidewalk, driveway, and siding. Put away blower (5 min)
13) Hook up sprinklers (5 min)
14) Go inside, take shower (15 min)
This is assuming no additional landscape work and that I'm not bagging the lawn - just over 2 hours start to finish.
The way I see it a ZTR would probably cut 60 min of mowing to 15. Also subtract another 15 minutes depending on the day as may not need to shower. An additional 10 minutes will be saved when I can get rid of the sprinklers.
I suppose when you think of it saving an hour each mow isn't a ton of time but when you have twins every second during the day counts :/
